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In order to increase the accelerating gradient of Superconducting RadioFrequency (SRF) cavities, Magnesium Diboride (MgB2) opens up hope because ofits high transition temperature and potential for low surface resistance in thehigh RF field regime. However, due to the presence of the small superconductinggap in the {\pi} band, the nonlinear response of MgB2 is potentially quitelarge compared to a single gap s-wave superconductor (SC) such as Nb.Understanding the mechanisms of nonlinearity coming from the two-band structureof MgB2, as well as extrinsic sources, is an urgent requirement. A localizedand strong RF magnetic field, created by a magnetic write head, is integratedinto our nonlinear-Meissner-effect scanning microwave microscope [1]. MgB2films with thickness 50 nm, fabricated by a hybrid physical-chemical vapordeposition technique on dielectric substrates, are measured at a fixed locationand show a strongly temperature-dependent third harmonic response. We proposethat at least two mechanisms are responsible for this nonlinear response, oneof which involves vortex nucleation and penetration into the film. [1] T. M.Tai, X. X. Xi, C. G. Zhuang, D. I. Mircea, S. M. Anlage, "Nonlinear Near-FieldMicrowave Microscope for RF Defect Localization in Superconductors", IEEETrans. Appl. Supercond. 21, 2615 (2011).

Mgb2 Nonlinear Properties Investigated under Localized High RF Magnetic Field Excitation